diff --git a/.bootstrap b/.bootstrap
index f4968829bd6cfcc753bd337c0480a0b9bbce36cf..22c27e9e1c978144ee202e491424763d82767878 100755
--- a/.bootstrap
+++ b/.bootstrap
@@ -1 +1,3 @@
+#! /bin/sh
+
 aclocal && autoconf && autoheader && automake -a